Question

briefly describe how nitrogen of the atmosphere is converted nitrate by leguminous plants
Pg No. 82 Concise Biology ICSE 9th Class Part-I

Answer 1

Fixation

Nitrogen in its gaseous form (N2) can’t be used by most living things. It has to be converted or ‘fixed’ to a more usable form through a process called fixation. There are three ways nitrogen can be fixed to be useful for living things:

Biologically: Nitrogen gas (N2) diffuses into the soil from the atmosphere,
and species of bacteria convert this nitrogen to ammonium ions (NH4+), which can be used by plants. Legumes(such as clover and lupins) are often grown by farmers because they have nodules on their roots that contain nitrogen-fixing bacteria.
Through lightning: Lightning converts atmospheric nitrogen into ammonia and nitrate (NO3) that enter soil with rainfall.
Industrially: People have learned how to convert nitrogen gas to ammonia (NH3-) and nitrogen-rich fertilisers to supplement the amount of nitrogen fixed naturally.

Answer 2

Answer:

Biologically:

Explanation:

Nitrogen gas (N2) diffuses into the soil from the atmosphere, and species of bacteria convert this nitrogen to ammonium ions (NH4+), which can be used by plants. Legumes(such as clover and lupins) are often grown by farmers because they have nodules on their roots that contain nitrogen-fixing bacteria.

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